using System.Text.Json;using Agent.Core.ToolCalling;​namespace Agent.Addons.Tools;​/// <summary>Example addon tool — returns demo weather text (not a live API).</summary>public static class GetWeatherTool{    public const string Name = "get_weather";​    public static void Register(ToolRegistry registry)    {        registry.Register(new AgentTool(            Name,            "Returns example weather for a city (demo addon; not a live forecast API).",            Invoke,            ParametersSchema));    }​    private static object ParametersSchema => new    {        type = "object",        properties = new        {            city = new { type = "string", description = "City or place name to describe weather for." }        },        required = new[] { "city" }    };​    private static string Invoke(string argumentsJson)    {        string city = ParseCity(argumentsJson);        if (string.IsNullOrWhiteSpace(city))        {            return "Error: Provide a city name (JSON property \"city\").";        }​        int seed = city.GetHashCode(StringComparison.OrdinalIgnoreCase);        string[] conditions = ["Sunny", "Partly cloudy", "Light rain", "Clear", "Overcast"];        string condition = conditions[Math.Abs(seed) % conditions.Length];        int tempC = 10 + (Math.Abs(seed) % 20);​        return $"Example weather for {city}: {condition}, about {tempC}°C (demo data from Agent-Addons).";    }​    private static string ParseCity(string argumentsJson)    {        try        {            using var doc = JsonDocument.Parse(argumentsJson);            if (doc.RootElement.TryGetProperty("city", out var cityProp))            {                return cityProp.GetString()?.Trim() ?? "";            }        }        catch (JsonException)        {            // fall through        }​        return "";    }}​